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The BioTown, USA Digester: One Piece of the BioEnergy System

The BioTown, USA Digester: One Piece of the BioEnergy System. Mark Jenner Biomass Rules. Overview: BioTown Digester. Drivers/motivators differ between farm manure digesters and the BioTown digester Reliance on the BioTown Technology Suite BioTown Digester has Challenges

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The BioTown, USA Digester: One Piece of the BioEnergy System

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  1. The BioTown, USA Digester:One Piece of the BioEnergy System Mark Jenner Biomass Rules

  2. Overview: BioTown Digester • Drivers/motivators differ between farm manure digesters and the BioTown digester • Reliance on the BioTown Technology Suite • BioTown Digester has Challenges • BioTown Digester has Benefits

  3. Traditional Hog Production Feed + Hogs Hogs (revenue) + Manure (cost) Hog House • Wastes are managed by minimizing costs • Best minimized costs = zero costs • Not the same as maximizing revenue

  4. Hog-Manure Production Today Feed + Hogs Hogs (revenue) + Manure (revenue) Hog House • Digesters are one way of adding value to manure • On-site source of feedstock • On-site transportation costs minimized

  5. BioTown USA Goals: Moving Reynolds, Indiana from fossil to biomass energy… • Conversion of liquid fuel utilization • Replacement of electrical supply • Replacement of natural gas supply

  6. BioTown Power and Light The system or ‘Suite of Technologies’ • Liquid biomass ⇒Anaerobic digester (methane gas) • Solid biomass ⇒Gasifier (producer/syn gas) ⇒Fast pyrolysis (liquid bio-oil, gas, char)

  7. BioTown Digester Role Gas (revenue) + Electric (revenue) + Liquid (revenue) + Nutrients (revenue) + Heat (revenue) Manure + Sewage + Stover + Paper BioTown Power & Light

  8. BioTown Digester Challenges • Multiple feedstocks (manure, sewage) • Community Digester (multiple sources, great transportation costs, biosecurity) • Digester technology selection

  9. Available Liquid Feedstocks (Max) Volume in = volume out

  10. Available Liquid Feedstocks (Min) Minimum size digester is 12.6% of the volume of Maximum size digester.

  11. Distance Traveled Adds Costs • Monticello and Monon sewage solids travel 6 or 7 miles. • Manure travels less than 2 miles 9 mile radius 2 mile radius

  12. Effluent Benefits and Costs

  13. Commercially-Available Digesters Returns/Efficiency High-end, high organic digesters $(+) Commercial farm manure digesters Private, Industrial waste digesters $0 Publicly-owned sewage digesters $(-)

  14. On-site vs. Off-site Digesters On-Site Hog House Digester Hog House Hog House Off-Site Digester Hog House

  15. On-site Lower transportation costs Less variability in feedstock quality Fewer biosecurity issues (-) size/scale effect on finished biomass Off-site Higher transportation costs More variability in feedstock quality Increased biosecurity issues (+) size/scale effect on finished biomass On-site vs. Off-site Digesters

  16. BioTown Digester Benefits • Multiple Conversion technologies – tune digester to other equipment: • 3 kinds of gas, 1 gen set. • 3 different operating temperatures (2,000 degrees; 1,000 degrees; and 100 degrees F) • Revenue from Sales / tipping fees • In-kind transfers of nutrients and liquid fuels

  17. Conclusion: BioTown Digester • Drivers/motivators differ between farm manure digesters and the BioTown digester • Reliance on the BioTown Technology Suite • BioTown Digester has Challenges • BioTown Digester has Benefits

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